Found this site that is the most useful one I came across.
How to fix wobbly forks in 30 minutes. Some special tools needed.
My bike failed what we call here in NZ a Warrant of Fitness as there was some slight movement when moving the forks back and forth.
My 2013 650 has done 80,000km so hopefully a little adjustment will fix things and I dont have to get the bearings replaced.